微反应器辅助合成磷酸锰铁锂正极材料  

Lithium iron manganese phosphate cathode from the precursors precipitated via a micro-reactor method

作　　者：王国静[1] 陈云超[1] 梁凯 马帅[1] 张小溪 杨晖[1] WANG Guojing;CHEN Yunchao;LIANG Kai;MA Shuai;ZHANG Xiaoxi;YANG Hui(College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China)

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2018年第3期1-5,37,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(21573109)

摘　　要：采用微反应器法制备前驱体Fe_3(PO_4)_2·8H_2O和Mn_3(PO_4)2·3H_2O磷酸盐材料,并通过固相法制备含C的磷酸铁锂LiFePO_4/C(LFP/C)、磷酸锰锂LiMnPO_4/C(LMP/C)和磷酸锰铁锂LiFe_(0.5)Mn_(0.5)PO_4/C(LFMP/C)以及不含C的磷酸锰铁锂LiFe_(0.5)Mn_(0.5)PO_4(LFMP)4种正极材料。分别采用X线衍射仪(XRD)、拉曼光谱仪(Raman)、扫描电子显微镜(SEM)和电化学测试系统进行样品结构、形貌和电化学性能的表征。结果表明:通过微反应器法控制p H可获得颗粒细小、均匀的纳米磷酸盐前驱体,LFMP/C拥有最高的首次放电比能量526.12W·h/kg,且放电比容量达146.82 mA·h/g,50次循环后容量保持率达94%,电化学性能优异。The precursor Fe3（PO4）2·8 H2O and Mn3（PO4）2·3 H2O particles were synthesized via a micro-reactor.The cathode materials Li Fe（0.5）Mn（0.5）PO4（LFMP） and carbon-coated LiFePO4/C（ LFP/C）,LiMnPO4/C（ LMP/C） and LiFe（0.5）Mn（0.5）PO4/C（ LFMP/C） were prepared via a solid-state process.Samples were analyzed by X-ray diffraction（ XRD）,Raman spectra,scanning electron microscope（ SEM）and electrochemical tests. Results showed that micro-reactor method with the control of pH value could obtain nano-sized phosphate precursor with uniform size. Among all the four obtained olivine cathode materials,LiFe（0.5）Mn（0.5）PO4/C delivered the highest energy density of 526. 12 W·h/kg and the capacities of 146. 82 mA·h/g in the first cycle,and remained 94% capacity retention after 50 cycles.

关 键 词：锂离子电池 微反应器 橄榄石正极材料 磷酸锰铁锂 磷酸盐 

分 类 号：TM912.9[电气工程—电力电子与电力传动]